Comminuting Apparatus with Flywheel for Secure Data Destruction
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Solution Overview
Problem
Existing devices for destroying sensitive materials, such as security badges and credit cards, fail to ensure that digital data is completely unrecoverable, as they do not effectively grind materials into fine particles that comply with NSA/CSS 04-02 standards, leading to potential data recovery.
Innovation Solution
A comminuting device with a rotatable mill core and flywheel, equipped with replaceable cutting edges, bed knife pairs, and a screen with 1.6 mm diameter holes, that simultaneously shears, grates, and filters materials, while being powered by a minimal number of moving parts and compatible with conventional vacuum cleaners, capable of processing approximately 700 CDs or DVDs per hour.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional cutting blades and sacrificial plates are used with zero clearance, then cutting precision is improved, but device complexity increases due to multiple shredders and metering mechanisms
Solution Approach 1:
The patent combines multiple cutting functions into a single comminuting chamber where a rotatable cutter with multiple blades simultaneously performs shearing, grating, and pumping actions. This eliminates the need for separate primary and secondary shredders, reducing device complexity while maintaining effective material destruction.
Solution Approach 2:
The rotatable cutter serves multiple functions: it shears material against bed knives, grates material through its peripheral edges, and pumps comminuted material toward the discharge screen. This multi-functionality reduces the number of components needed while achieving comprehensive material comminution.
2Ease of operation
If rotary scissor action with curved blades is used, then cutting action is improved, but ease of operation deteriorates due to critical feed angle and position requirements
Solution Approach 1:
The patent employs a rotatable cutter that rotates continuously, dynamically presenting cutting edges to incoming material from multiple angles. This eliminates the need for precise static feed positioning, as the rotating blades naturally accommodate variations in material placement while maintaining effective cutting action.
3Reliability
If multiple moving parts are used in comminuting devices, then productivity is improved, but reliability deteriorates due to increased complexity and potential failure points
Solution Approach 1:
The patent merges multiple cutting stages into a single integrated comminuting chamber with a rotatable cutter and bed knives. This reduces the number of moving parts and potential failure points while maintaining high comminuting capacity through the simultaneous action of multiple blades and knives.
Solution Approach 2:
The rotatable cutter operates continuously, with multiple blades constantly engaging material as it rotates. This continuous action maintains high productivity without requiring complex multi-stage systems, as the rotating cutter constantly presents fresh cutting edges to incoming material.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The device efficiently grinds materials into fine particles, ensuring that digital data is unrecoverable, meeting NSA/CSS 04-02 standards, with increased efficiency and reliability, and can be adapted to handle various materials like credit cards.
Implementation Method 1
a flywheel type weight enabling the device to grind materials in to fine particles
Implementation Method 2
The mill core simultaneously performs shearing, grating, pumping of material to the next shearing zone
Implementation Method 3
grinding planer material to particles wherein digital material is unrecoverable
Implementation Method 4
a screen with 1.6 mm diameter holes, that simultaneously shears, grates, and filters materials
Data Source
AI summary
A device for comminuting media materials that store sensitive information. The device is a rotating mill core with removable flat edged blades, a set of stacked bed knives and a screen. The mill core rotates in close proximity to adjustable bed knives to shear the material being fed before passing through a screen in order to grate the material. The mill core has an angular positioned blade constructed and arranged to shear material with said bed knives. The mill core has a mass and is operated at 1000 rpm. A flywheel is further attached to the mill core in order to conserve rotational energy and improve the efficiency of the device. Vacuum ports facilitate cleanup.